Are you using an Android device to store your Bitcoin, and if so, what operating system version are you on right now?
Mobile security for Android users seems to be tough to achieve these days, especially when considering how the source code of the Stagefright Metaphor exploit has been released into the wild. NorthBit, the Israeli security company responsible for the publication of this code, mentioned how only Nexus 5 devices are vulnerable to the software in its current form. That being said, it is relatively easy to target any device by any manufacturer, and Bitcoin users will need to be more vigilant than ever for the time being.
http://bitcoinist.net/android-bitcoin-users-beware-stagefright-metaphor-code-released-on-github/